0w-30

I use premium or plus gas almost always. How do you check the valves?

 

Remove the valve covers and crank the engine clockwise by wrench until the valve lobes point up off the buckets the cam lobes ride on, from there youre intake valves and exhaust valves will be able to have a feeler gauge slid under them. Under the hood is a sticker with the valve clearance specs, if the valves are tighter than specs it could be ready for headwork if they are close to the lowest valve specs you'll be able to just reshim the valves and get the added benefit of more power. If you have any more questions let me know, this is just a quick reply I can put picks up in a few hours.